A thought for diagnostics

STF clone project.
Post Reply
User avatar
exxos
Site Admin
Site Admin
Posts: 4995
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

A thought for diagnostics

Post by exxos » Tue Sep 18, 2018 11:19 pm

I wonder if a new simple ROM could be done, a small loop which would basically pulse each address line one by one...

.. Would probably have to wire DTACK low else it probably cause a BERR as not every address is used etc...

Also probably have to hardwire ROM chip enable to gnd as we dont know if GLUE decoding is even working right yet..

Though at least it would help diagnose things, as a small loop in ROM can just be 68000 code only, and address lines pulsing can be seen on the scope.. at least then we know the CPU is running as it should..

Probably just a bunch of reads from each address range into the CPU internal registers.. nothing more..
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

troed
Software Moderator
Software Moderator
Posts: 471
Joined: Mon Aug 21, 2017 10:27 pm

Re: A thought for diagnostics

Post by troed » Wed Sep 19, 2018 7:38 am

Well we've seen bombs. That means, I believe, CPU is working, GLUE is working, MMU is working, Shifter is working.

User avatar
exxos
Site Admin
Site Admin
Posts: 4995
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: A thought for diagnostics

Post by exxos » Wed Sep 19, 2018 9:10 am

Only on one machine.. The other isn't doing anything, and I would imagine there are about 15 other boards out there to diagnose yet as well.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

Post Reply